Recording and reproducing phonographic diaphragm device



March 8, 1932. A. A. PENTEADO RECORDING AND REPRODUCING PHONOGRAPHIG DIAPHRAGM DEVICE Filed Aug. 18, 1930 Patented Mar. 8, 1932 UNITED STATES PATENT OFFICE mmumo ALVARES rmmno, or mars, mncn Application flied August 18, 1980, Serial No. 478,222, and in France June 12, 1930.

My invention has for its object improvements in phonographs for the direct recording of sounds, and for their reproduction.

The phonograph according to my invention comprises a diametrical arm freely mounted at the center of the diaphragm so that it can be turned throu h 180 and fixed in opposite positions- I aid arm is provided at one end with a cutting style for recording and at the other end with a sharp point for reproducing sounds.

It will be understood that, in order to pass from recording to reproducing or inversely, there is but to turn said arm through 180.

A referred embodiment ofmy invention will e described with reference to the appended drawings, in which:

Fig. 1 is a front view of the diaphragm provided with its arm.

Fig. 2 is a section on the line 2-2 ofFig. 1.

Fig. 3 is a view similar to that of Fig. 1, the arm being removed.

Fig. 4. is a section on the line 44 of Fig. 3, the fixation nut being unscrewed.

Figs. 5 and 6 are a front and a side elevation respectively of the point carrying arm.

As shown in the drawings, the phonograph according to my invention comprises an arm 1 (Figs. 5 and 6) carrying at one end a cutting style 2 for recording andat the other end a sharp point 3 for reproducing. The style and the point are held in position by means of plates 4a and 46 secured by screws 5:; and 5?) respectively. The arm is applied against a base 6 which is glued to the diaphragm 7 (Figs. 1 to 4) of the sound box 8. Arm 1 is pressed against base 6 by means of a cylindrical nut 8a, which is screwed on the screw-threaded rod 9 provided at the center screw 50; (Figs. 2 to (S) into the groove 12 of v the base 6 (Figs. 2 to 4) and to suitably maintain said arm, thus preventing it from rotat- TVhen it is desired to use the diaphragm for reproducing, there is but to slightly unscrew nut 8a, then to push arm 1"u ward. The extension 50 of screw 5a is then isengaged from groove 12 and it is thenossibleto turn arm 1 through 180 about r 9. The arm is then pulled upward as previously explained so that rod 9 may engage the slot 11b, while the extension 5d of screw 5b is maintained in groove 12. It is therefore not necessary to remove the nut for usin the diaphragm either for reproducing or or recording, and even not for removing arm 1 in order to substitute a needle for another one.

The diaphragm is connected to the tone arm through a central tube 13.

While I have in theabove description endeavoured to disclose what I believe to be an efiicient and. practical embodiment of my invention, it is to be understood that the invention is not limited by the specific details as shown, but that it is subject to many and all structural variations which may express the invention and at the same time come within the scope of the appended claims.

What I claim is:

1. A phonograph for recording and reproducing sounds comprising a diaphragm, an arm removdbly mounted in a diametral position on said diaphragm in parallel relation thereto, means for fixing said arm with respect to said diaphragm in either of two positions at 180 to each other, a cutting style for recording at one end of said arm, and a sharp point for reproducing at the other. end of said arm. I

2. A phono raph adapted for directly recording soun s and reproducing them, comprising a diaphragm, a base glued on said diaphragm, a screw-threaded rod on said plate at the center of the diaphragm, a removable diametral arm adapted to be turned through 180, a cylindrical nut adapted to engage said rod for applying said arm on said base, a cutting style for recording at one end of said arm, and a sharp point for reproducing at the other end of said arm.

'3. A phonograph adapted for directly re- 21 gamers cording sounds and reproducing them, comprising a diaphragm, a base g uedon said diaphragm, a screw-threaded rod on said base v at the center of the diaphragm is cylindrical nut adapted to engage said ro a removable diametral arm provided with a central hole having a diameter slightlylarger than that of the cylindrical nut and two slots on each side of said hole having a width substantial- 1 equal to the diameter of the rod, whereby.

t e arm can be applied on the base without removing the nut and set in position by'enga ing one of the slots on the rod and then tening the nut, a cuttingstyle for recording at one end of thearm, and a sharp point for regrodueing at the other end of the arm. 4. phonograph adapted for directly recording sounds and reproducing them, comprising a diaphragm, a base glued on said m'diaphragm and provided with a groove, 2. screw-threaded rod on said base at the center of the diaphragm, a cylindrical nut adapted to engage said rod, a removable arm provided with a central hole having a. diameter 25 slightly larger than that of the cylindrical nut and two slots on each side of said hole having a width substantially equal to the diameter of the rod, whereby the arm can be applied on the base without removing the 80 nut and set in position by engaging one of the slots on the rod and then tightening the nut, a cutting style for recording at one end of the arm, a sharp point for reproducing at the other end of the arm, and screws for 35 fixing saidstyle and said point on the arm adapted to engage the groove provided in the base so as to prevent any rotation of the arm once it is set in position.

In testimony whereof I have signed this 40 specification.

ARMANDO ALVARES PENTEADO. 

